Knockdown mold for cement products



JARED L. HOBBS, OF SAN- DIEGO,

CALIFORNIA.

KNOCK DOWN IVIOLD FOR- CEMENT PRODUCTS.

Specification of Letters Patent. Patented lVIal'. 30, 1920- Application filed October 16, 1919. Serial No. 331,223. v I

To all whom it may concern Be it known that I, JARED L. Ho Bs, a citizen of the United'States, a resident of San Diego, in the county of San Diego and State of California, have invented a new and usefulKnockdown Mold for Cement Products, of which the following is a specification.

My invention relates to cores for use in molding laundry trays, burial vaults, bath tubs, sinks, and the like, and has for its primary object the provision of a knock down or collapsible core, which when assembled, is rigid, but which may be taken from the cast'in sections thereby rendering the Withdrawal easier than if it werewithdrawn in one solid core. Other objects will appear as the description progresses.

Figure 1','*is' a plan-view of the assembled device; Fig. 2, an end elevation of Fig. 1; Fig. 3, an elevation of a section of Fig. 1, taken on the line A-B; Fig. 4, an elevation of the inside of the end section 3; Fig. 5, an end elevation of Fig. 4; Fig. 6, a plan view of the front section; Fig. 7 a plan view of the bottom section; Fig. 8, a plan view of the rear section; Fig. 9, a rear elevation of the foundation frame, mounted on trestles, the legs of the trestles being partly broken away, the assembled core in an inverted position within the outside form, one end of the outside form being removed to show the core. Fig. 10, a plan view of the foundation frame, drawn to a reduced scale; Fig. 11, a fragmentary view of the frame 15, and bolts 16, drawn to an enlarged scale, partly in section; and Fig. 12, fragmentary views showing an end and front elevation of the latch 24.

Although I have shown an adaptation for use in molding laundry trays, I do not wish to be understood to limit myself tothis particular use, but wish it understood that various adaptations of the invention may be made within the scope of what hereinafter is claimed without departing from the spirit of the invention.

Similar reference characters refer to like parts throughout the several views.

The core comprises a front section 1, and a rear section 2, having pins 12, latches 18, and lugs 20, mounted thereon; two end sections 3, and 4, having lugs 20, and cleats 11, brazed thereon, said cleats being provided with holes 19, adapted to fit over said pins 12, and to be held in position by the latches 18; and a bottom section 5, which rests be cast.

against lugs 20, when the core is in the inverted position shown in Fig. 9. In use the foundation frame 15, having a series of bolts, 16, therein and provided with recesses 26, for the reception of the bent end of said bolts 16, is laid on trestles 21, and the core placed within said frame in an inverted position. so that the edge rests upon the bolts 16, which are extended within said frame, the bent end pointing upward, and made to press snugly against the inside of the core, by tightening the thumb nuts 17. The outside form comprises two end sections 6, and 7, having straight cleats 13, brazed on the outside thereof; said cleats having holes therein adapted to'fit over pins 25, on the front and rear sections; and the front section 8,.having-latches 24, and pins 25, mounted thereon and a rear section having similar latches and pins. The contour of the inside of the outside form is similar to that of the core so that when spaced from the core a tray having walls of uniform thickness may The outside form is'placed upon the frame 15, within theridge 23, and the concrete is poured through the openin 9, into the mold, thus formed until it is full, when a straight edge is drawn acrossthe opening and the bottom of the tray is squared up.

In 24 hours, the core may be removed from the tray without turning it over, as follows: After loosening thumb nuts 17 and giving the bolts 16, a quarter turn, they may be withdrawn into the recesses 26, of the frame 15; the latches 18, are released; an end is removed by grasping the edge which has been resting on the bolts 16, andpulling it approximately horizontally, which releases it from the wall of the trayand permits it to be withdrawn below, the remaining end section and the front and rear sections are removed in the same manner when the bottom may be grasped at one end and removed, thereby leaving the inside of the tray empty. The outside form is removed by releasing the latches 24, and pullifing the end sections away from the tray rst. i

What I claim as new and desire to secure by Letters Patent is:

1. A knock down core of the class described, comprising a front and a rear section having pins on the inside of the end portions thereof and lugs on the bottom portions thereof; two end sections having extensions thereon at the edges thereof, said extensions being adapted to hook over said pins; latches mounted on said front and rear sections adapted to latch against said extensions; and a bottom adapted to fit against said lugs; for the purposes set forth.

2. A knock down core of the class described, comprising four separate sections; extensions on the end sections adapted to press against the end portions of the front and rear sections; latches on the front and rear sections adapted to latch against said extensions; and a bottom disposed between said sections; for the purposes set forth.

A core of the class described, comprising two end sections having extensions on the edges thereof, and bent lower portions; a front and a rear section having latches thereon adapted to latch against said extensions on said end sections, said front and rear sections having a bent lower portion and bent end portions; and a bottom disposed between the bent lower portions of said sections; for the purposes set fort-h.

a. An outside form of the class described, comprising a rear and a front section having pins on the outside of the end portions thereof and lugs on the bottom portions thereof; two end sections having extensions thereon at the edges thereof, said extensions being adapted to hook over said pins; latches mounted on said front and rear sec tions adapted to latch against said extensions; for the purposes set forth.

5. A device of the class described, comprising a horizontally disposed form having a series of horizontally disposed bolts therein, each having a bent portion; thumb nuts on said bolts on the outside of said frame; a core mounted in said frame on said bolts; an outside for-1n mounted on said frame and spaced from said core; for the purposes set forth.

6. An outside form of the class described, comprising two end sections having extensions on the edges thereof, and bent lower portions; a front and a rear section having latches thereon adapted to latch against said extensions on said end sections, said front and rear sections having a bent loWer por tion and bent end portions; for the purposes set forth.

JARED L. HOBBS. 

